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what is the difference between a slow blow and fast acting fuse

by Mrs. Sierra Littel III Published 3 years ago Updated 2 years ago

Slow Blow Fuse disconnects the circuit only when the overcurrent situation continues to stay in the supply line. Therefore, it is not an instantaneous job. But the major difference is a Fast Acting fuse will immediately disconnect the circuit as soon as the overcurrent is detected.May 5, 2020

Full Answer

Is an AGC Fuse considered fast or slow blow?

“AGC” stands for “automotive glass cartridge” “MDL” stands for “method detection limit” It is generally understood that an “AGC” fuse is fast blow whereas a “MDL” fuse is slow blow. viperrwk.

What is the purpose of a slow blow fuse?

  • Current rating of the fuse.
  • Voltage rating of the fuse.
  • Time - current characteristic; i.e. fuse speed.
  • Approvals by national and international standards agencies.
  • Manufacturer / part number /series.
  • Interrupting rating ( breaking capacity)

What is the characteristic of slow blow fuse?

A Slow-blow fuse is a type of fuse which can handle a temporary surge current which exceeds the current rating of the fuse. A slow-blow fuse does not blow for a temporary surge current; it must receive a sustained elevated current above its current rating for a period of time before it blows.

How to identify fast blow fuse?

Unplug electrical appliances. First and foremost, it’s important to identify where the outage occurred. Turn the power off. Next, you will need to turn off the main power to the fuse box. Find the fuse box. Identify the broken fuse. Replace the fuse. Test your new setup. How fast does a fuse blow? 0.1 seconds

How can you tell the difference between a slow blow and fast acting fuse?

Look through the tube of the fuse glass and check the wire filament within. If there is a thin wire, you have a fast-blow fuse. If you see a thick wire that has a very small spring at one end, you will know it is a slow-blow fuse.

When should I use a slow blow fuse?

The time-delay, or "slow blow", fuses were developed for situations where acceptable momentary overloads are encountered, such as starting a motor. As the name implies, this type of fuse will carry an overload several times the normal load for a short period of time without blowing.

What is a fast blow fuse used for?

Fast Acting fuses are designed to protect less sensitive components and are also used to protect cabling from melting or catching fire when an overload occurs. Fast acting fuses are the most common type of fuse.

How do you know if a fuse is fast acting?

If there's no label, you will find engraved lettering on the housing of the fuse. Another way to find out the difference is to look into the glass tube of the fuse. A thick wire with a tiny spring at one end makes it a slow-blow fuse while a thin wire means that it's a fast acting fuse.Jan 26, 2018

What are the 3 types of fuses?

Different Types of Fuses – Constriction, Working & CharacteristicsDC Fuses.AC Fuses.Cartridge Fuses.D – Type Cartridge Fuse.HRC (High Rupturing Capacity) Fuse or Link Type Cartridge Fuse.High Voltage Fuses.Automotive, Blade Type & Bolted Type Fuses.SMD Fuses (Surface Mount Fuse), Chip , Radial, and Lead Fuses.More items...

Do microwaves use fast blow or slow blow fuses?

Answer:Microwave fuse should use slow-blow type because its loading will increase much when microwave starts. It needs a little overload when machine starts(only a short time).

What is the difference between slow blow and time delay fuses?

Slow-Blow Fuses Slow blow (time delay) fuses have built-in time delay features that prevent them from blowing during intermittent current surges (large motors, air conditioners and dryers). Time delay fuses blow under constant or repeated current overload conditions.Jul 17, 2017

What's the meaning of slow fuse?

if someone hase a slow fuse, it means they are not easily upset or angered.

The Definition of A Slow-Blow Fuse and A Fast-Blow Fuse

A slow-blow fuse is defined as a fuse that can tolerate high levels of voltage for a short period without shorting itself. This means that when a s...

The Uses For A Slow-Blow Fuse and A Fast-Blow Fuse

A slow-blow fuse is normally used in the motor industry because when you start an engine, at that moment, a high current of electricity is passed t...

The Slow-Blow Fuse vs. The Fast-Blow Fuse

As you can see, it’s not a matter of which fuse is better than the other but rather which is fuse best for a particular situation. These two kinds...

Why is a slow blow fuse used?

A slow-blow fuse is normally used in the motor industry because when you start an engine, at that moment, a high current of electricity is passed through the electronic circuit. Hence, the fuses could be blown.

Why use a fast blow fuse?

Therefore, you need a prompt reaction to counter this problem, and this is where a fast-blow fuse comes in handy. The fast-blow fuse permits the home appliance to survive by instantly shorting itself instead of the electronic circuit.

What happens if you can't distinguish between two fuses?

Otherwise, you will damage the electronic equipment, and, even more importantly, you could get electrocuted and suffer serious injury. More From Doityourself.

What are the different types of fuses?

There are various types of fuses: a slow-blow fuse, a fast-blow fuse, and a two-blade mini fuse. In today’s market, we find a fuse for every electronic need. If you are a beginner or you don’t have any experience whatsoever in electrical work, then you have to learn to distinguish among different types of fuses.

What is fast acting fuse?

In a fast acting fuse the thermal dissipation in the wire acts to melt the wire portion that is carrying it. There is some effect from adjacent heat but much reduced from a slow-blow.

Why is the wire coiled in a slow blow fuse?

In slow blow fuse the wire is (generally) coiled to provide proximity to heat energy from the adjacent wire plus the cooling path is increased by having a much longer wire length and thus thermal path to the mounting points. The accumulated heat from adjacent sections helps blow the fuse.

How many overload regions does a surge protection fuse have?

A surge protection fuse must accommodate three overload regions. For a short circuit it must blow fast in the normal way. It must also blow for steady overload currents just like an F fuse, but it must tolerate continual brief over-currents -- say ten times its rating -- without blowing or deteriorating.

What is the M effect?

The third method employs the 'M' effect. In the 1930s Prof. A.W.Metcalf (hence the 'M') researched a phenomenon where the tin alloy used to solder the ends of the fuse seemed to affect the time to blow, reducing it in a strange way.

What is the second technique of fusible element?

The second technique employs a three part fusible element.The first part is a wire with a high melting point so that it will absorb surges, while still blowing fast on extreme overload. This is similar to an F fuse working at well below its rating, so it will not protect against overloads close to the rated current.

Do fuses have to be slow blow?

If it's a Power Amp then it would make sense for the fuses to be slow blow (also called anti-surge), bearing in mind you have an inductor (the transformer) feeding large capacitors so there is going to be quite a surge at switch on. If you want to play safe use quick blow fuses but they may blow easily and often.

Where is the marking on a fuse?

The marking will be somewhere on the case of the fuse. On glass tube fuses, it's usually engraved (sometimes very badly) on the metal part of the body. There is no good way to non-destructively detect what type of fuse a fuse is if it is unmarked.

The Fast Blow Fuse Vs. Slow Blow Fuse

Now that you have a proper definition of a fast-blow fuse and a slow-blow fuse. Let us look at the differences between the two.

How To Tell If A Fuse Is A Fast Or Slow Blow?

For the most part, a fuse is a sacrificial element in a circuit. It either suffers and survives the brunt of an overflowing current or burns out.

Conclusion

It is straightforward to overlook fuses and consider them trivial. However, in the absence of one, you have more to lose. Although miniature fuses play an integral part in ensuring your appliance and devices are safe from the electric current overload.

What is a fast acting fuses?

Fast Acting Fuses (Fast Blow, General Purpose or General Application Fuses) Fast Acting fuses are designed to protect less sensitive components and are also used to protect cabling from melting or catching fire when an overload occur s. Fast acting fuses are the most common type of fuse. The manufacturer's time current curves are useful in determing ...

What is the speed of a fuse?

The speed of a fuse is essentially the time it takes for the fuse to open when a fault current occurs. The speed at which a fuse opens is governed by the material used in the fuse element, the overload current and the ambient operating temperature. For example, if a current of 20A was flowing through a fuse rated at 10A, ...

What is an ultra rapid fuses?

Ultra Rapid Fuses (Very Fast Acting, High Speed, Super Rapid, Ultra Rapid or Semiconductor Fuses)#N#Ultra Rapid fuses primarily provide short circuit protection for semiconductor devices such as diodes, thyristors, transistors etc. As they tend to operate at higher temperatures, this often restricts the use of low melting point alloys, thereby providing a limited capability to protect against low over-current conditions. It is very important to know the I²t value of the fuse when protecting semiconductor devices. To ensure the device is adequately protected, the I²t value of the fuse must be less than the I²t value of the device the fuse is protecting.

What is the most common type of fuse?

Fast acting fuses are the most common type of fuse. The manufacturer's time current curves are useful in determing the exact speed of a fuse for different overloads. 3a. Slow Acting (Slow Blow, Time Delay or Motor Start Fuses)

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